WIP moving ggfx stuff into xcanvas

canvas/canvas.go

@@ -4,22 +4,23 @@ import "image"
 import "image/color"
 import "github.com/jezek/xgbutil"
 import "github.com/jezek/xgb/xproto"
-import "git.tebibyte.media/tomo/ggfx"
 import "github.com/jezek/xgbutil/xgraphics"
 import "git.tebibyte.media/tomo/tomo/canvas"
 
 // Canvas satisfies the canvas.Canvas interface. It draws to an xgraphics.Image.
+// It must be closed after use.
 type Canvas struct {
 	*xgraphics.Image
 }
 
-// New creates a new canvas from a bounding rectangle.
-func New (x *xgbutil.XUtil, bounds image.Rectangle) *Canvas {
-	return NewFrom(xgraphics.New(x, bounds))
+// NewCanvas creates a new canvas from a bounding rectangle.
+func NewCanvas (x *xgbutil.XUtil, bounds image.Rectangle) *Canvas {
+	return NewCanvasFrom(xgraphics.New(x, bounds))
 }
 
-// NewFrom creates a new canvas from an existing xgraphics.Image.
-func NewFrom (image *xgraphics.Image) *Canvas {
+// NewCanvasFrom creates a new canvas from an existing xgraphics.Image. Note
+// that calling Close() on the resulting canvas will destroy this image.
+func NewCanvasFrom (image *xgraphics.Image) *Canvas {
 	if image == nil { return nil }
 	return &Canvas { image }
 }
@@ -28,12 +29,6 @@ func NewFrom (image *xgraphics.Image) *Canvas {
 func (this *Canvas) Pen () canvas.Pen {
 	return &pen {
 		image: this.Image,
-		gfx:   ggfx.Image[uint8] {
-			Pix:    this.Image.Pix,
-			Stride: this.Image.Stride,
-			Rect:   this.Image.Rect,
-			Width:  4,
-		},
 	}
 }
 
@@ -53,6 +48,12 @@ func (this *Canvas) Push (window xproto.Window) {
 	this.XExpPaint(window, this.Bounds().Min.X, this.Bounds().Min.Y)
 }
 
+// Close frees this canvas from the X server.
+func (this *Canvas) Close () {
+	this.assert()
+	this.Image.Destroy()
+}
+
 func (this *Canvas) assert () {
 	if this == nil { panic("nil canvas") }
 }
@@ -64,35 +65,34 @@ func (this *Canvas) assert () {
 
 type pen struct {
 	image *xgraphics.Image
-	gfx    ggfx.Image[uint8]
 
 	closed bool
 	endCap canvas.Cap
 	joint  canvas.Joint
 	weight int
 	align  canvas.StrokeAlign
-	stroke [4]uint8
-	fill   [4]uint8
+	stroke xgraphics.BGRA
+	fill   xgraphics.BGRA
 }
 
 func (this *pen) Rectangle (bounds image.Rectangle) {
 	if this.weight == 0 {
-		this.gfx.FillRectangle(this.fill[:], bounds)
+		this.gfx.fillRectangle(bounds)
 	} else {
-		this.gfx.StrokeRectangle(this.stroke[:], this.weight, bounds)
+		this.gfx.strokeRectangle(bounds)
 	}
 }
 
 func (this *pen) Path (points ...image.Point) {
 	if this.weight == 0 {
-		this.gfx.FillPolygon(this.fill[:], points...)
+		this.fillPolygon(points...)
 	} else if this.closed {
-		this.gfx.StrokePolygon(this.stroke[:], this.weight, points...)
+		this.strokePolygon(points...)
 	} else {
-		this.gfx.PolyLine(this.stroke[:], this.weight, points...)
+		this.polyLine(points...)
 	}
 }
- 
+
 func (this *pen) Closed       (closed bool)              { this.closed = closed }
 func (this *pen) Cap          (endCap canvas.Cap)        { this.endCap = endCap }
 func (this *pen) Joint        (joint  canvas.Joint)      { this.joint  = joint  }
@@ -100,14 +100,14 @@ func (this *pen) StrokeWeight (weight int)               { this.weight = weight
 func (this *pen) StrokeAlign  (align canvas.StrokeAlign) { this.align  = align  }
 
 func (this *pen) Stroke (stroke color.Color) { this.stroke = convertColor(stroke) }
-func (this *pen) Fill (fill color.Color)     { this.fill   = convertColor(fill)   }
+func (this *pen) Fill   (fill color.Color)   { this.fill   = convertColor(fill)   }
 
-func convertColor (c color.Color) [4]uint8 {
+func convertColor (c color.Color) xgraphics.BGRA {
 	r, g, b, a := c.RGBA()
-	return [4]uint8 {
-		uint8(b >> 8),
-		uint8(g >> 8),
-		uint8(r >> 8),
-		uint8(a >> 8),
+	return xgraphics.BGRA {
+		B: uint8(b >> 8),
+		G: uint8(g >> 8),
+		R: uint8(r >> 8),
+		A: uint8(a >> 8),
 	}
 }

canvas/draw.go

@@ -0,0 +1,5 @@
+package xcanvas
+
+func (this *pen) fillRectangle (bounds image.Rectangle) {
+
+}

canvas/texture.go

@@ -0,0 +1,60 @@
+package xcanvas
+
+import "image"
+
+// Texture is a read-only image texture that can be quickly written to a canvas.
+// It must be closed manually after use.
+type Texture struct {
+	pix         []uint8
+	stride      int
+	rect        image.Rectangle
+	transparent bool
+}
+
+// NewTextureFrom creates a new texture from a source image.
+func NewTextureFrom (source image.Image) *Texture {
+	bounds := source.Bounds()
+	texture := &Texture {
+		pix:    make([]uint8, bounds.Dx() * bounds.Dy() * 4),
+		stride: bounds.Dx(),
+		rect:   bounds.Sub(bounds.Min),
+	}
+
+	index := 0
+	var point image.Point
+	for point.Y = bounds.Min.Y; point.Y < bounds.Max.Y; point.Y ++ {
+	for point.X = bounds.Min.X; point.X < bounds.Max.X; point.X ++ {
+		r, g, b, a := source.At(point.X, point.Y).RGBA()
+		texture.pix[index + 0] = uint8(b >> 8)
+		texture.pix[index + 1] = uint8(g >> 8)
+		texture.pix[index + 2] = uint8(r >> 8)
+		texture.pix[index + 3] = uint8(a >> 8)
+		index += 4
+
+		if a != 0xFFFF {
+			texture.transparent = true
+		}
+	}}
+	
+	return texture
+}
+
+// Opaque reports whether or not the texture is fully opaque.
+func (this *Texture) Opaque () bool {
+	return !this.transparent
+}
+
+// Close frees the texture from memory.
+func (this *Texture) Close () error {
+	// i lied we dont actually need to close this, but we will once this
+	// texture resides on the x server or in video memory.
+	return nil
+}
+
+// Clip returns a subset of this texture that points to the same data.
+func (this *Texture) Clip (bounds image.Rectangle) *Texture {
+	clipped := *this
+	clipped.rect = bounds
+	return &clipped
+}
+